Fixed more fuzzer issues

src/effects/SkDashPathEffect.cpp

Index: src/effects/SkDashPathEffect.cpp
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index 40990585024730af184931f0f53f014b855771bf..fc1c80bd2beca36787fbe6b2d6f4f34ec5491726 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -554,6 +554,11 @@ SkDashPathEffect::SkDashPathEffect(SkFlattenableReadBuffer& buffer) : INHERITED(
     fScaleToFit = buffer.readBool();
 
     fCount = buffer.getArrayCount();
-    fIntervals = (SkScalar*)sk_malloc_throw(sizeof(SkScalar) * fCount);
-    buffer.readScalarArray(fIntervals, fCount);
+    size_t allocSize = sizeof(SkScalar) * fCount;
+    if (buffer.validateAvailable(allocSize)) {
+        fIntervals = (SkScalar*)sk_malloc_throw(allocSize);
+        buffer.readScalarArray(fIntervals, fCount);
+    } else {
+        fIntervals = NULL;
+    }
 }